I have a 1995 sc400 with a bad hesitation, has two codes, 52 and 55 both knock sensors, The car hesitates between 1500 and 2600 rpms after 2700 it seems to run fine. The hesitation if at light throdle is so bad the drive train slaps back and forth. I have replace the MAF, TPS, check the fuel pump, ran it in high speed. None of this helps. If I pull the MAF cable off and the ECU is in limp home mode. The car RUN GRET, Also check both coils, seems fine. I have even used a analog scope to check most of the input at the computer, I see the MAF, TPS, O2 values, engine temp, cam signals, gee did I leave anything out. I even check the VF1 and VF2 learn air fuel ratio, both are around 2.1v, Can't sigure this one out, I put new cap's and rotors on last night and will change the plugs tonight to see if this help, but I see no reason why it should, when the car runs great in limp mode. ECU bad?
have the same problem?
Monday, April 29th, 2013 AT 11:14 AM